James c



(No Model.)

- J. O. WILLIAMS. MACHINE FOR CUTTING THREADS ON BOLTS.

No. 434,898. Patented Aug. 19, 1890.

lqvEqLu James 6: M'ZZz'ams UNITED STATES PATENT ()FFICE.

JAMES C. WILLIAMS, OF ERIE, PENNSYLVANIA, ASSIGNOR TO THE JARECKIMANUFACTURING COMPANY, LIMITED, OF SAME PLACE.

MACHINE FOR CUTTING THREADS ON BQLTS.

SPECIFICATION forming part of Letters Patent'No. 434,898, dated August19, 1890.

Serial No. 844,807. (No model.)

To all whom it may concern:

Be it known that I, JAMES C. WILLIAMS, a citizen of the United States,residing at Erie, in the county of Erie and State of Pennsylvania, haveinvented certain new and useful Improvements in Bolt-Thread Cutters; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, forming part of this specification.

My invention consists in the improvements in bolt-thread cuttershereinafter set forth and explained, and illustrated in the accompanyingdrawings, in which Figure 1 is a plan view of ahead-b1ock and head of abolt-thread cutter embodying my improvements. Fig. 2 is an end elevationof the head of my improved bolt-thread cutter. Fig. 3 is a verticallongitudinal section of same. Fig. at is a perspective view of the headportion of my improved bolt-threadcutter head. Fig. 5 is a perspectiveview of one of the die-operating guides used in my bolt-thread-cutterhead. Fig. 6 is a'perspectiveview of one of the dies used in myimprovedboltthread-cutter head. Fig. 7 is an end elevation of an alternativeconstruction of my improved bolt-thrcad-cutter head.

Like letters'refer to like parts in all of the figures.

In the construction of my improved boltthread-cutter head shown, A isone of the headblocks, in which the shaft B of the head revolves. Uponthe outer end of the shaft B (which shaft B is preferably made hollowthroughout its entire length) is secured the head 0 of my improvedbolt-thread-cutter head. This section of the head, being provided in itsouter end with radial slots d, is adapted to receive radially-movingthreading dies D, which dies are secured in place by means of afaceplate E, secured to the outer end of the section 0 by means oftap-screws e. The section 0 is also provided with longitudinal Tshapedslots F, which cut the outer ends of the radial slots cl, in which slotsF longitudinally-movin g die-operating guides G, provided witlflongitudinal ribs 13, operate. These dieoperating guides G, I makepreferably of tempered steel,and they are each provided with an inclinedT-sha'ped slot H, formed in the under surface of the outer end of theguides,which T- shaped slots are adapted to receive the outer ends ofthe threading-dies D and engage with pins f, inserted transverselythrough the upper ends of the threading-dies D, so that the longitudinalmovement of the die-operating guides G operates the threading-dies Dradially in and out, as desired. To the rear ends h of thethreading-guides G, Isecu re aloose collar J by means of tap-screws j,passing through a flange K on the collar J, into the ends h of thethreading-die guides G, so that the collar J will move longitudinally onthe shaft B in unison with the threading-die guides G. Between thesection 0 of the head and the slid- 7o ing collar J, I place smallspiral springs S, which are compressed by moving the collarJ outward,and which operate automatically to move the collar J back when released.In the collar J is an annular groove 70, in which groove 70 a loose ringL operates. In opposite sides of the ring L are secured studs Z, whichengage with the opposite sides m and n of a cylindrical opening in theoperating lever M.

The fulcrum of this lever M is in the form of 8c a screw-threaded studN,which passes through an internally-tilreaded sleeve 0, secured in oneend of the head-block A, so as to be rotated therein, loymeans whereofthe fulcrum N can be adjusted in and out at pleasure, a locknut P on thestud N operating to secure it in place when properly adjusted.

To the opposite end of the head-block A is secured an arm Q, having acatch Qthereon, which is adapted to engage a sliding springdog 1),operated by means of a small bellcrank lever B, pivoted to a lug R onthe arm M of the lever M.

In Fig. 7 I show an end elevation of an alternative construction of myimproved boltthread-cutter head. In this construction I place alongitudinally-sliding ring I around the section 0 of the head, whichring I is se cured to the periphery of the outer ends of the slidingthreading-die guides G by means 'IOO of tap-screws g, so that thethreading-die guides G and ring I will move together on the section ofthe head. In this construction I can, if I so desire, do away with theT-shaped of the lever M by the operator moves the coltion and repair ofmachines of this character] Having thus fully described my invention,

lar J and the threading-die guides G longitudinally back and forth,which operates to move the threading-dies D in and out radially, asdesired. The adjustment of the movement of the dies D is accomplished bymoving the fulcrum N of the operating-lever M in and out such distancesas may be desired by the rotation of the internally-threaded sleeve 0,the catch in the arm Q at the opposite end of the lever M being fixedand stationary. Thus by means of the adjustment of the fulcrum N of theoperating-lever M the dies D can be adjusted to operate on any-sizedbolt desired of a head-section O, having longitudinal T- Y shaped slotsF therein, nally-ribbed threading-die actuating-guides G, substantiallyas and for the purpose set within the scope of the machine.

,I am aware that radially-moving dies have heretofore been made tooperate in inclined T-shaped grooves in a sleeve sliding over thecentral section of a bolt-thread-cutter head.

In my construction, however, I have done i of a sliding collar J,adapted to be coupled to away with this sleeve, and also with the headsor shoes on the threading-dies, and am enabled to use a threading-diewith simply a steel pin inserted transversely therein; and I also doaway with the slotted sleeve heretofore employed for moving thethreading-dies, and am enabled to use tempered steel threading-dieguides, which in case of injury or wear can easily and quickly bereplaced with others, thus greatly simplifying the construcwhat I claimas new, and desire to secure by Letters Patent of the United States, is

1. The combination, in a bolt-thread cutter, of a longitudinally andradially slotted head-section secured to the shaft, radially- I movingthreading-dies in the radial slots, and

longitudinally-moving threading-die guides in the longitudinal slots insaid head-section engaging and actuating said threading-dies, with aloose collar adapted to slide on the shaft back of said head-section,secured to the inner ends of said longitudinally-moving threading-dieguides, substantially as and for the purpose-set forth.

2. The combination, in a bolt-thread cut- I ter, of alongitudinally-sliding collar mounted on the shaft back of the head andconnected with the die-actuating guides of said cutterhead, and a leverpivoted to a loose annular ring on said collar for moving said collarlongitudinally on the shaft, with an adjustable fulcrum on themachine-frame, to which one arm of said actuating-lever is pivoted, anda I fixed catch adapted to engage the opposite arm of saidactuating-lever, substantially as and for the purpose set forth.

3. In a bolt-thread cutter, the combination a lever M for moving saidcollar .I longitudinally on the shaft of the machine, with the fulcrum Nof the lever M and the ad-J justing-sleeve O thereon, and the fixedcatch Q, substantially as and for the purpose set forth.

In testimony whereof I affix my signature-

